Originally Posted by mpsllc
It can take alot of flushing to get the resin flushed out of the piping too. Sometimes the softener piping at the wall is plumbed backwards and this causes alot of wrong connections. Not unusual for me to find this even with a valve on it. Best to verify which is the supply.
That is the first thing I do when installing a softener, even if there's one already there. I'll cut the loop (or remove the old w/s) and then crack the service with a bucket under each pipe. After I see which one the water is coming out of, I solder on a ball valve. Then I turn the water on again to double check.
I once was installing a w/s and followed my normal routine. After I had the ball valve on I turned the water on and found water flowing out of the other line. So I soldered on a second valve and turned the water on again. Pressure at both valves!
Somebody had plumbed the loop wrong; no 90's in the attic but rather tees. The house was fairly new so I left the h.o. to deal with the builder on that but I told them I couldn't install their w/s.